Ultimate Fighting champ Tito Ortiz was arrested Monday on charges of beating up his live-in girlfriend, porn queen Jenna Jameson, at their Southern California home, according to published reports.

Ortiz, 35, the father of Jameson's 13-month-old twin boys, was hauled off to jail in handcuffs and charged with felony domestic violence, TMZ.com reported.

Cops went to the couple's Huntington Beach home after a 9:53 a.m. 911 call about a "disturbance," TMZ.com reported.

Jameson, 36, who made the call, had "visible injuries" when officers spoke to her about what happened, according to the web site.

Ortiz, the 6-foot-3, 205-pound former light heavyweight champ of Ultimate Fighting, was being booked at the Huntington Beach Jail. The 5-foot-7, 110-pound porn star told the web site she plans to press charges.